Growth Hormone Stimulation Test by Clonidine: Booking, Price, and Results
About Growth Hormone Stimulation Test by Clonidine
| Field | Value |
|---|---|
| Also Known As | Clonidine GH Stimulation Test, GH Provocation Test with Clonidine, Clonidine Challenge Test |
| Sample Type | Serum (multiple venous blood samples at timed intervals) |
| Fasting Required | Yes; 8 to 12 hours of overnight fasting required |
| Report Time | 3 days (test procedure takes approximately 2 to 3 hours) |
| Recommended For | Children with suspected growth hormone deficiency; also used in adults with suspected pituitary or hypothalamic disorders |
| Price | Starting at ₹3,900 |
What Is a Growth Hormone Stimulation Test by Clonidine?
The growth hormone stimulation test by Clonidine checks whether the pituitary gland (a small gland at the base of the brain) can release enough growth hormone (GH) when triggered. Clonidine, a tablet that stimulates specific receptors in the brain, is given during the test to prompt this release. The test is most commonly ordered for children who show signs of slow growth or short stature, and is also known as the Clonidine GH Stimulation Test or GH Provocation Test. Multiple blood samples are drawn at set time points to track the GH response.
What Does a Growth Hormone Stimulation Test by Clonidine Measure?
The test measures the pituitary gland's ability to release growth hormone after being prompted by clonidine. A single GH reading from a routine blood test is not reliable on its own because GH levels vary throughout the day. The stimulation approach gives a clearer picture of the gland's actual reserves.
Peak Growth Hormone (GH): The highest GH level recorded across all timed samples. This peak value shows whether the pituitary gland can produce and release adequate GH when stimulated.
Why Is a Growth Hormone Stimulation Test by Clonidine Done?
A doctor may recommend the growth hormone stimulation test by Clonidine when a child is not growing at the expected rate or when an adult shows signs of pituitary underactivity. The test helps confirm or rule out a growth hormone deficiency.
Common Symptoms That May Require This Test
- Noticeably short stature or a child growing much more slowly than peers
- Low blood glucose levels in infants and toddlers
- Delayed puberty
- Persistent fatigue without a clear cause
- Abnormal growth patterns affecting the hands and feet
- Changes in bone density detected on other investigations
Conditions This Test Can Help Detect
- Growth hormone deficiency (GHD) in children and adults
- Hypopituitarism (reduced function of the pituitary gland)
- Pituitary or hypothalamic damage following brain surgery, pituitary surgery, radiation therapy, head injury, or brain tumours
How to Prepare and What to Expect
Preparation for the growth hormone stimulation test by Clonidine procedure is straightforward, but it must be followed carefully to ensure accurate results.
Do You Need to Fast?
Yes, fasting is required. The patient must not eat or drink anything except plain water for 8 to 12 hours before the test. This includes hard candy, chewing gum, and flavoured water. Eating or drinking anything other than water can alter the GH response and affect the test outcome.
Practical Tips Before Your Test
- Bring a detailed clinical history including symptoms, previous test results, and relevant medical records, as this is required for the test.
- Inform your doctor about all medications being taken, as some can affect GH secretion.
- Avoid exercise or strenuous physical activity on the day of the test.
- Patients with low blood pressure, heart disease, or certain neurological conditions should inform their doctor before the test, as clonidine can temporarily lower blood pressure and cause sedation.
- Ensure thyroid function is normal before the test, as an underactive thyroid can affect results. Your doctor will advise if additional checks are needed.
Step-by-Step Procedure
- The patient arrives at the testing facility in the morning (typically around 7:00 am) and is asked to lie down comfortably. A small cannula (thin tube) is inserted into a vein to allow blood to be drawn at multiple time points without repeated needle insertions.
- After a resting period of approximately 30 to 40 minutes, a baseline blood sample is taken to measure GH levels before any medication is given.
- A measured oral dose of clonidine is administered. Clonidine is a tablet that stimulates the pituitary gland to release growth hormone.
- Further blood samples are collected at 30, 60, 90, and 120 minutes after the tablet is taken.
- Throughout the test, heart rate and blood pressure are monitored closely, as clonidine can cause a temporary drop in blood pressure and mild drowsiness.
- Once the final sample is collected, normal eating and drinking can resume. Rest is advised for the remainder of the day.
Factors That Can Affect Accuracy
- Fasting status (not fasting adequately before the test)
- Thyroid function (abnormal thyroid levels can distort GH response)
- Body weight (children with obesity may show a lower peak GH response)
- Pubertal stage and age
- Medications that affect pituitary function, including steroids
- Stress or illness at the time of testing
Understanding Your Growth Hormone Stimulation Test by Clonidine Results
Results are assessed by looking at the highest (peak) GH level recorded across all timed samples. The table below shows general reference ranges used to interpret the peak GH response.
| Interpretation | Threshold | Unit |
|---|---|---|
| Normal peak GH (children, standard) | Greater than 10 | ng/mL |
| Equivocal; further evaluation may be needed (children) | 5 to 8 | ng/mL |
| Suggests GH deficiency (children) | Less than 5 | ng/mL |
| Normal peak GH (adults) | 3 to 5 | ng/mL |
These ranges are general guidelines. Your doctor will interpret your results based on your age, health history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.
Results During Special Conditions
- Body weight has a direct effect on GH response. Children with overweight or obesity tend to show lower peak GH levels during stimulation, which can sometimes lead to an incorrect suggestion of deficiency. Doctors account for body mass index when reviewing results.
- A single test showing a low GH response is not enough to confirm growth hormone deficiency. A second stimulation test using a different agent is usually required before a definitive diagnosis is made.
How to Maintain Healthy Levels
These general wellness habits support the body's natural GH production:
- Ensure children receive balanced, nutritious meals to support healthy growth and development.
- Encourage regular physical activity and adequate sleep, both of which support natural GH release.
- Maintain a healthy body weight, as excess weight can interfere with GH secretion.
Lupin Diagnostics Growth Hormone Stimulation Test by Clonidine Price and Booking
The growth hormone stimulation test by Clonidine cost starts at ₹3,900 at Lupin Diagnostics. This test requires a visit to a Lupin Diagnostics centre; home collection is not available due to the need for clinical supervision, multiple timed blood draws, and on-site blood pressure monitoring. The city-wise pricing details are provided below.
| City | Approximate Price (₹) |
|---|---|
| BHOPAL | 3900 |
| CHENNAI | 3900 |
| HYDERABAD | 3900 |
| KOLKATA | 3900 |
| NAVI MUMBAI | 3900 |
| PUNE | 3900 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
Follow these steps to book your growth hormone stimulation test by Clonidine online:
- Select the test on the Lupin Diagnostics website.
- Choose your city and preferred time slot.
- Visit the centre at your scheduled time for sample collection and clinical monitoring.
- Receive your report via email or WhatsApp within 3 days.
Frequently Asked Questions
The growth hormone stimulation test by Clonidine checks whether the pituitary gland can release adequate growth hormone when prompted. A clonidine tablet is given, and blood samples are drawn at timed intervals to measure the GH response. It is most often used to investigate slow growth or short stature in children.
Clonidine is an oral tablet that is generally well tolerated. It works by activating specific receptors in the brain that signal the pituitary gland to release GH. Its ease of administration and established safety profile make it a common choice for this type of test.
The test takes approximately 2 to 3 hours from the baseline sample to the final collection. Blood is drawn at set intervals (30, 60, 90, and 120 minutes after taking the tablet).
The most common side effect is drowsiness, which typically resolves within a few hours. Clonidine may also cause a temporary, mild drop in blood pressure. Medical staff monitor the patient throughout the test and can manage any such changes as needed.
Yes, it can. Higher body weight is associated with a lower peak GH value, which may make GH levels appear insufficient even when the pituitary gland is functioning normally. Doctors take body weight and BMI into account when interpreting results.
A single low result does not confirm a diagnosis on its own. In most cases, a second stimulation test using a different agent is carried out before any conclusion is reached. Your doctor will review all findings together, including height measurements and growth charts, before deciding on next steps.
Growth Hormone Stimulation Test by Clonidine
